| 摘要 |
An ultraviolet ray-absorbing plastic plate which cuts off ultraviolet rays for extended periods of time to protect objects of art from ultraviolet rays and mechanical damage. The ultraviolet ray-absorbing plastic plate is obtained by polymerizing a polymerizable mixture which consists of a radical polymerizable compound containing at least one radical polymerizable monomer which has two or more alpha - beta unsaturated double bonds such as diethylene glycol bisallyl carbonate, a benzophenone-type ultraviolet ray-absorbing agent, and a radical polymerization initiator. The ultraviolet ray-absorbing plastic plate of the invention has a crosslinked structure, does not permit the ultraviolet ray-absorbing agent to bleed out of the surface of the plastic plate even after it has been used for extended periods of time, exhibits excellent properties such as great mechanical strength and heat resistance, and is transparent. Therefore, the plastic plate of the invention is used for protecting eyes and objects of art from the ultraviolet rays, i.e., used as an ultraviolet ray-shielding plate being installed in front of, for instance, a CRT display, as a member for protecting a picture frame, and as a member for cutting off ultraviolet rays generated from a source of light such as lighting apparatus. |
